3 * Copyright (c) 2001-2002, Larry Wall
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
8 * "Hand any two wizards a piece of rope and they would instinctively pull in
9 * opposite directions."
12 * Contributed by Arthur Bergman arthur@contiller.se
13 * pulled in the (an)other direction by Nick Ing-Simmons nick@ing-simmons.net
16 #define PERL_NO_GET_CONTEXT
23 #define SHAREDSvPTR(a) ((a)->sv)
26 * The shared things need an intepreter to live in ...
28 PerlInterpreter *PL_sharedsv_space; /* The shared sv space */
29 /* To access shared space we fake aTHX in this scope and thread's context */
31 /* bug #24255: we include ENTER+SAVETMPS/FREETMPS+LEAVE with
32 * SHARED_CONTEXT/CALLER_CONTEXT macros, so that any mortals etc created
33 * while in the shared interpreter context don't languish */
35 #define SHARED_CONTEXT \
37 PERL_SET_CONTEXT((aTHX = PL_sharedsv_space)); \
42 /* So we need a way to switch back to the caller's context... */
43 /* So we declare _another_ copy of the aTHX variable ... */
44 #define dTHXc PerlInterpreter *caller_perl = aTHX
46 /* and use it to switch back */
47 #define CALLER_CONTEXT \
51 PERL_SET_CONTEXT((aTHX = caller_perl)); \
55 * Only one thread at a time is allowed to mess with shared space.
61 PerlInterpreter *owner;
70 recursive_lock_t PL_sharedsv_lock; /* Mutex protecting the shared sv space */
73 recursive_lock_init(pTHX_ recursive_lock_t *lock)
75 Zero(lock,1,recursive_lock_t);
76 MUTEX_INIT(&lock->mutex);
77 COND_INIT(&lock->cond);
81 recursive_lock_destroy(pTHX_ recursive_lock_t *lock)
83 MUTEX_DESTROY(&lock->mutex);
84 COND_DESTROY(&lock->cond);
88 recursive_lock_release(pTHX_ recursive_lock_t *lock)
90 MUTEX_LOCK(&lock->mutex);
91 if (lock->owner != aTHX) {
92 MUTEX_UNLOCK(&lock->mutex);
95 if (--lock->locks == 0) {
97 COND_SIGNAL(&lock->cond);
100 MUTEX_UNLOCK(&lock->mutex);
104 recursive_lock_acquire(pTHX_ recursive_lock_t *lock,char *file,int line)
107 MUTEX_LOCK(&lock->mutex);
108 if (lock->owner == aTHX) {
112 while (lock->owner) {
114 Perl_warn(aTHX_ " %p waiting - owned by %p %s:%d\n",
115 aTHX, lock->owner, lock->file, lock->line);
117 COND_WAIT(&lock->cond,&lock->mutex);
126 MUTEX_UNLOCK(&lock->mutex);
127 SAVEDESTRUCTOR_X(recursive_lock_release,lock);
130 #define ENTER_LOCK STMT_START { \
132 recursive_lock_acquire(aTHX_ &PL_sharedsv_lock, __FILE__, __LINE__); \
135 #define LEAVE_LOCK LEAVE
138 /* A common idiom is to acquire access and switch in ... */
139 #define SHARED_EDIT STMT_START { \
144 /* then switch out and release access. */
145 #define SHARED_RELEASE STMT_START { \
155 Shared SV is a structure for keeping the backend storage
158 Shared-ness really only needs the SV * - the rest is for locks.
159 (Which suggests further space optimization ... )
164 SV *sv; /* The actual SV - in shared space */
165 recursive_lock_t lock;
166 perl_cond user_cond; /* For user-level conditions */
169 /* The SV in shared-space has a back-pointer to the shared_sv
170 struct associated with it PERL_MAGIC_ext.
172 The vtable used has just one entry - when the SV goes away
173 we free the memory for the above.
178 sharedsv_shared_mg_free(pTHX_ SV *sv, MAGIC *mg)
180 shared_sv *shared = (shared_sv *) mg->mg_ptr;
181 assert( aTHX == PL_sharedsv_space );
183 recursive_lock_destroy(aTHX_ &shared->lock);
184 COND_DESTROY(&shared->user_cond);
185 PerlMemShared_free(shared);
191 MGVTBL sharedsv_shared_vtbl = {
196 sharedsv_shared_mg_free, /* free */
201 /* Access to shared things is heavily based on MAGIC - in mg.h/mg.c/sv.c sense */
203 /* In any thread that has access to a shared thing there is a "proxy"
204 for it in its own space which has 'MAGIC' associated which accesses
208 MGVTBL sharedsv_scalar_vtbl; /* scalars have this vtable */
209 MGVTBL sharedsv_array_vtbl; /* hashes and arrays have this - like 'tie' */
210 MGVTBL sharedsv_elem_vtbl; /* elements of hashes and arrays have this
211 _AS WELL AS_ the scalar magic */
213 /* The sharedsv_elem_vtbl associates the element with the array/hash and
214 the sharedsv_scalar_vtbl associates it with the value
218 /* Accessor to convert threads::shared::tie objects back shared_sv * */
220 SV_to_sharedsv(pTHX_ SV *sv)
222 shared_sv *shared = 0;
225 shared = INT2PTR(shared_sv *, SvIV(SvRV(sv)));
230 =for apidoc sharedsv_find
232 Given a private side SV tries to find if the SV has a shared backend,
233 by looking for the magic.
238 Perl_sharedsv_find(pTHX_ SV *sv)
241 if (SvTYPE(sv) >= SVt_PVMG) {
245 if ((mg = mg_find(sv, PERL_MAGIC_tied))
246 && mg->mg_virtual == &sharedsv_array_vtbl) {
247 return (shared_sv *) mg->mg_ptr;
251 /* This should work for elements as well as they
252 * have scalar magic as well as their element magic
254 if ((mg = mg_find(sv, PERL_MAGIC_shared_scalar))
255 && mg->mg_virtual == &sharedsv_scalar_vtbl) {
256 return (shared_sv *) mg->mg_ptr;
261 /* Just for tidyness of API also handle tie objects */
262 if (SvROK(sv) && sv_derived_from(sv, "threads::shared::tie")) {
263 return SV_to_sharedsv(aTHX_ sv);
269 * Almost all the pain is in this routine.
274 Perl_sharedsv_associate(pTHX_ SV **psv, SV *ssv, shared_sv *data)
278 SV *sv = (psv) ? *psv : Nullsv;
280 /* If we are asked for an private ops we need a thread */
281 assert ( aTHX != PL_sharedsv_space );
283 /* To avoid need for recursive locks require caller to hold lock */
284 assert ( PL_sharedsv_lock.owner == aTHX );
286 /* First try and get existing global data structure */
288 /* Try shared SV as 1st choice */
289 if (!data && ssv && SvTYPE(ssv) >= SVt_PVMG) {
290 if( (mg = mg_find(ssv, PERL_MAGIC_ext)) ){
291 data = (shared_sv *) mg->mg_ptr;
295 /* Next see if private SV is associated with something */
297 data = Perl_sharedsv_find(aTHX_ sv);
300 /* If neither of those then create a new one */
307 data = PerlMemShared_malloc(sizeof(shared_sv));
308 Zero(data,1,shared_sv);
309 SHAREDSvPTR(data) = ssv;
310 /* Tag shared side SV with data pointer */
311 sv_magicext(ssv, ssv, PERL_MAGIC_ext, &sharedsv_shared_vtbl,
313 recursive_lock_init(aTHX_ &data->lock);
314 COND_INIT(&data->user_cond);
319 ssv = SHAREDSvPTR(data);
320 if (!SHAREDSvPTR(data))
321 SHAREDSvPTR(data) = ssv;
323 /* If we know type upgrade shared side SV */
324 if (sv && SvTYPE(ssv) < SvTYPE(sv)) {
326 sv_upgrade(ssv, SvTYPE(*psv));
327 if (SvTYPE(ssv) == SVt_PVAV) /* #24061 */
332 /* Now if requested allocate private SV */
334 *psv = sv = newSV(0);
337 /* Finally if private SV exists check and add magic */
340 if (SvTYPE(sv) < SvTYPE(ssv)) {
341 sv_upgrade(sv, SvTYPE(ssv));
346 if (!(mg = mg_find(sv, PERL_MAGIC_tied))
347 || mg->mg_virtual != &sharedsv_array_vtbl
348 || (shared_sv *) mg->mg_ptr != data) {
350 sv_setref_iv(obj, "threads::shared::tie",PTR2IV(data));
352 sv_unmagic(sv, PERL_MAGIC_tied);
354 mg = sv_magicext(sv, obj, PERL_MAGIC_tied, &sharedsv_array_vtbl,
356 mg->mg_flags |= (MGf_COPY|MGf_DUP);
361 char* stash_ptr = SvPV((SV*) SvSTASH(ssv), len);
362 HV* stash = gv_stashpvn(stash_ptr, len, TRUE);
364 SvSTASH(sv) = (HV*)SvREFCNT_inc(stash);
370 if ((SvTYPE(sv) < SVt_PVMG)
371 || !(mg = mg_find(sv, PERL_MAGIC_shared_scalar))
372 || mg->mg_virtual != &sharedsv_scalar_vtbl
373 || (shared_sv *) mg->mg_ptr != data) {
375 sv_unmagic(sv, PERL_MAGIC_shared_scalar);
377 mg = sv_magicext(sv, Nullsv, PERL_MAGIC_shared_scalar,
378 &sharedsv_scalar_vtbl, (char *)data, 0);
379 mg->mg_flags |= (MGf_COPY|MGf_DUP);
384 assert ( Perl_sharedsv_find(aTHX_ *psv) == data );
390 Perl_sharedsv_free(pTHX_ shared_sv *shared)
395 SvREFCNT_dec(SHAREDSvPTR(shared));
401 Perl_sharedsv_share(pTHX_ SV *sv)
405 Perl_croak(aTHX_ "Cannot share globs yet");
409 Perl_croak(aTHX_ "Cannot share subs yet");
414 Perl_sharedsv_associate(aTHX_ &sv, 0, 0);
421 #if defined(WIN32) || defined(OS2)
422 # define ABS2RELMILLI(abs) \
424 abs -= (double)time(NULL) \
425 if (abs > 0) { abs *= 1000; } \
428 #endif /* WIN32 || OS2 */
431 Perl_sharedsv_cond_timedwait(perl_cond *cond, perl_mutex *mut, double abs)
433 #if defined(NETWARE) || defined(FAKE_THREADS) || defined(I_MACH_CTHREADS)
434 Perl_croak_nocontext("cond_timedwait not supported on this platform");
443 /* See comments in win32/win32thread.h COND_WAIT vis-a-vis race */
444 switch (WaitForSingleObject(cond->sem, abs)) {
445 case WAIT_OBJECT_0: got_it = 1; break;
446 case WAIT_TIMEOUT: break;
448 /* WAIT_FAILED? WAIT_ABANDONED? others? */
449 Perl_croak_nocontext("panic: cond_timedwait (%ld)",GetLastError());
462 if ((rc = DosResetEventSem(*cond,&n_a)) && (rc != ERROR_ALREADY_RESET))
463 Perl_rc = rc, croak_with_os2error("panic: cond_timedwait-reset");
465 if (CheckOSError(DosWaitEventSem(*cond,abs))
466 && (rc != ERROR_INTERRUPT))
467 croak_with_os2error("panic: cond_timedwait");
468 if (rc == ERROR_INTERRUPT) errno = EINTR;
471 # else /* hope you're I_PTHREAD! */
475 ts.tv_sec = (long)abs;
476 abs -= (NV)ts.tv_sec;
477 ts.tv_nsec = (long)(abs * 1000000000.0);
479 switch (pthread_cond_timedwait(cond, mut, &ts)) {
480 case 0: got_it = 1; break;
481 case ETIMEDOUT: break;
483 Perl_croak_nocontext("panic: cond_timedwait");
489 #endif /* NETWARE || FAKE_THREADS || I_MACH_CTHREADS */
492 /* MAGIC (in mg.h sense) hooks */
495 sharedsv_scalar_mg_get(pTHX_ SV *sv, MAGIC *mg)
497 shared_sv *shared = (shared_sv *) mg->mg_ptr;
501 if (SHAREDSvPTR(shared)) {
502 if (SvROK(SHAREDSvPTR(shared))) {
504 Perl_sharedsv_associate(aTHX_ &obj, SvRV(SHAREDSvPTR(shared)), NULL);
505 sv_setsv_nomg(sv, &PL_sv_undef);
511 sv_setsv_nomg(sv, SHAREDSvPTR(shared));
519 sharedsv_scalar_store(pTHX_ SV *sv, shared_sv *shared)
524 shared_sv* target = Perl_sharedsv_find(aTHX_ SvRV(sv));
528 tmp = newRV(SHAREDSvPTR(target));
529 sv_setsv_nomg(SHAREDSvPTR(shared), tmp);
531 if(SvOBJECT(SvRV(sv))) {
532 SV* fake_stash = newSVpv(HvNAME(SvSTASH(SvRV(sv))),0);
533 SvOBJECT_on(SHAREDSvPTR(target));
534 SvSTASH(SHAREDSvPTR(target)) = (HV*)fake_stash;
545 sv_setsv_nomg(SHAREDSvPTR(shared), sv);
547 SV* fake_stash = newSVpv(HvNAME(SvSTASH(sv)),0);
548 SvOBJECT_on(SHAREDSvPTR(shared));
549 SvSTASH(SHAREDSvPTR(shared)) = (HV*)fake_stash;
554 Perl_croak(aTHX_ "Invalid value for shared scalar");
559 sharedsv_scalar_mg_set(pTHX_ SV *sv, MAGIC *mg)
563 /* We call associate to potentially upgrade shared side SV */
564 shared = Perl_sharedsv_associate(aTHX_ &sv, Nullsv, (shared_sv *) mg->mg_ptr);
566 sharedsv_scalar_store(aTHX_ sv, shared);
572 sharedsv_scalar_mg_free(pTHX_ SV *sv, MAGIC *mg)
574 shared_sv *shared = (shared_sv *) mg->mg_ptr;
576 assert (SvREFCNT(SHAREDSvPTR(shared)) < 1000);
578 Perl_sharedsv_free(aTHX_ shared);
583 sharedsv_scalar_mg_clear(pTHX_ SV *sv, MAGIC *mg)
589 * Called during cloning of new threads
592 sharedsv_scalar_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
594 shared_sv *shared = (shared_sv *) mg->mg_ptr;
596 SvREFCNT_inc(SHAREDSvPTR(shared));
601 MGVTBL sharedsv_scalar_vtbl = {
602 sharedsv_scalar_mg_get, /* get */
603 sharedsv_scalar_mg_set, /* set */
605 sharedsv_scalar_mg_clear, /* clear */
606 sharedsv_scalar_mg_free, /* free */
608 sharedsv_scalar_mg_dup /* dup */
611 /* Now the arrays/hashes stuff */
613 sharedsv_elem_mg_FETCH(pTHX_ SV *sv, MAGIC *mg)
616 shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
617 shared_sv *target = Perl_sharedsv_find(aTHX_ sv);
621 assert ( SHAREDSvPTR(shared) );
624 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
625 assert ( mg->mg_ptr == 0 );
627 svp = av_fetch((AV*) SHAREDSvPTR(shared), mg->mg_len, 0);
630 char *key = mg->mg_ptr;
631 STRLEN len = mg->mg_len;
632 assert ( mg->mg_ptr != 0 );
633 if (mg->mg_len == HEf_SVKEY) {
634 key = SvPV((SV *) mg->mg_ptr, len);
637 svp = hv_fetch((HV*) SHAREDSvPTR(shared), key, len, 0);
641 /* Exists in the array */
642 target = Perl_sharedsv_associate(aTHX_ &sv, *svp, target);
646 /* Not in the array */
647 sv_setsv(sv, &PL_sv_undef);
654 sharedsv_elem_mg_STORE(pTHX_ SV *sv, MAGIC *mg)
657 shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
660 /* Theory - SV itself is magically shared - and we have ordered the
661 magic such that by the time we get here it has been stored
662 to its shared counterpart
666 assert(SHAREDSvPTR(shared));
667 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
668 assert ( mg->mg_ptr == 0 );
670 svp = av_fetch((AV*) SHAREDSvPTR(shared), mg->mg_len, 1);
673 char *key = mg->mg_ptr;
674 STRLEN len = mg->mg_len;
675 assert ( mg->mg_ptr != 0 );
676 if (mg->mg_len == HEf_SVKEY)
677 key = SvPV((SV *) mg->mg_ptr, len);
679 svp = hv_fetch((HV*) SHAREDSvPTR(shared), key, len, 1);
682 target = Perl_sharedsv_associate(aTHX_ &sv, *svp, 0);
683 sharedsv_scalar_store(aTHX_ sv, target);
689 sharedsv_elem_mg_DELETE(pTHX_ SV *sv, MAGIC *mg)
693 shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
695 sharedsv_elem_mg_FETCH(aTHX_ sv, mg);
696 if ((shmg = mg_find(sv, PERL_MAGIC_shared_scalar)))
697 sharedsv_scalar_mg_get(aTHX_ sv, shmg);
698 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
700 av_delete((AV*) SHAREDSvPTR(shared), mg->mg_len, G_DISCARD);
703 char *key = mg->mg_ptr;
704 STRLEN len = mg->mg_len;
705 assert ( mg->mg_ptr != 0 );
706 if (mg->mg_len == HEf_SVKEY)
707 key = SvPV((SV *) mg->mg_ptr, len);
709 hv_delete((HV*) SHAREDSvPTR(shared), key, len, G_DISCARD);
717 sharedsv_elem_mg_free(pTHX_ SV *sv, MAGIC *mg)
719 Perl_sharedsv_free(aTHX_ SV_to_sharedsv(aTHX_ mg->mg_obj));
724 sharedsv_elem_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
726 shared_sv *shared = SV_to_sharedsv(aTHX_ mg->mg_obj);
727 SvREFCNT_inc(SHAREDSvPTR(shared));
728 mg->mg_flags |= MGf_DUP;
732 MGVTBL sharedsv_elem_vtbl = {
733 sharedsv_elem_mg_FETCH, /* get */
734 sharedsv_elem_mg_STORE, /* set */
736 sharedsv_elem_mg_DELETE, /* clear */
737 sharedsv_elem_mg_free, /* free */
739 sharedsv_elem_mg_dup /* dup */
743 sharedsv_array_mg_FETCHSIZE(pTHX_ SV *sv, MAGIC *mg)
746 shared_sv *shared = (shared_sv *) mg->mg_ptr;
749 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
750 val = av_len((AV*) SHAREDSvPTR(shared));
753 /* not actually defined by tie API but ... */
754 val = HvKEYS((HV*) SHAREDSvPTR(shared));
761 sharedsv_array_mg_CLEAR(pTHX_ SV *sv, MAGIC *mg)
764 shared_sv *shared = (shared_sv *) mg->mg_ptr;
766 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
767 av_clear((AV*) SHAREDSvPTR(shared));
770 hv_clear((HV*) SHAREDSvPTR(shared));
777 sharedsv_array_mg_free(pTHX_ SV *sv, MAGIC *mg)
779 Perl_sharedsv_free(aTHX_ (shared_sv *) mg->mg_ptr);
784 * This is called when perl is about to access an element of
788 sharedsv_array_mg_copy(pTHX_ SV *sv, MAGIC* mg,
789 SV *nsv, const char *name, int namlen)
791 shared_sv *shared = (shared_sv *) mg->mg_ptr;
792 MAGIC *nmg = sv_magicext(nsv,mg->mg_obj,
793 toLOWER(mg->mg_type),&sharedsv_elem_vtbl,
796 SvREFCNT_inc(SHAREDSvPTR(shared));
798 nmg->mg_flags |= MGf_DUP;
803 sharedsv_array_mg_dup(pTHX_ MAGIC *mg, CLONE_PARAMS *param)
805 shared_sv *shared = (shared_sv *) mg->mg_ptr;
806 SvREFCNT_inc(SHAREDSvPTR(shared));
807 mg->mg_flags |= MGf_DUP;
811 MGVTBL sharedsv_array_vtbl = {
814 sharedsv_array_mg_FETCHSIZE, /* len */
815 sharedsv_array_mg_CLEAR, /* clear */
816 sharedsv_array_mg_free, /* free */
817 sharedsv_array_mg_copy, /* copy */
818 sharedsv_array_mg_dup /* dup */
821 =for apidoc sharedsv_unlock
823 Recursively unlocks a shared sv.
828 Perl_sharedsv_unlock(pTHX_ shared_sv* ssv)
830 recursive_lock_release(aTHX_ &ssv->lock);
833 =for apidoc sharedsv_lock
835 Recursive locks on a sharedsv.
836 Locks are dynamically scoped at the level of the first lock.
841 Perl_sharedsv_lock(pTHX_ shared_sv* ssv)
845 recursive_lock_acquire(aTHX_ &ssv->lock, __FILE__, __LINE__);
848 /* handles calls from lock() builtin via PL_lockhook */
851 Perl_sharedsv_locksv(pTHX_ SV *sv)
857 shared = Perl_sharedsv_find(aTHX_ sv);
859 croak("lock can only be used on shared values");
860 Perl_sharedsv_lock(aTHX_ shared);
863 =head1 Shared SV Functions
865 =for apidoc sharedsv_init
867 Saves a space for keeping SVs wider than an interpreter,
872 Perl_sharedsv_init(pTHX)
875 /* This pair leaves us in shared context ... */
876 PL_sharedsv_space = perl_alloc();
877 perl_construct(PL_sharedsv_space);
879 recursive_lock_init(aTHX_ &PL_sharedsv_lock);
880 PL_lockhook = &Perl_sharedsv_locksv;
881 PL_sharehook = &Perl_sharedsv_share;
884 #endif /* USE_ITHREADS */
886 MODULE = threads::shared PACKAGE = threads::shared::tie
893 PUSH(shared_sv *shared, ...)
897 for(i = 1; i < items; i++) {
898 SV* tmp = newSVsv(ST(i));
901 target = Perl_sharedsv_associate(aTHX_ &tmp, Nullsv, 0);
902 sharedsv_scalar_store(aTHX_ tmp, target);
904 av_push((AV*) SHAREDSvPTR(shared), SHAREDSvPTR(target));
905 SvREFCNT_inc(SHAREDSvPTR(target));
911 UNSHIFT(shared_sv *shared, ...)
917 av_unshift((AV*)SHAREDSvPTR(shared), items - 1);
919 for(i = 1; i < items; i++) {
920 SV* tmp = newSVsv(ST(i));
921 shared_sv *target = Perl_sharedsv_associate(aTHX_ &tmp, Nullsv, 0);
922 sharedsv_scalar_store(aTHX_ tmp, target);
924 av_store((AV*) SHAREDSvPTR(shared), i - 1, SHAREDSvPTR(target));
925 SvREFCNT_inc(SHAREDSvPTR(target));
932 POP(shared_sv *shared)
938 sv = av_pop((AV*)SHAREDSvPTR(shared));
940 ST(0) = sv_newmortal();
941 Perl_sharedsv_associate(aTHX_ &ST(0), sv, 0);
947 SHIFT(shared_sv *shared)
953 sv = av_shift((AV*)SHAREDSvPTR(shared));
955 ST(0) = sv_newmortal();
956 Perl_sharedsv_associate(aTHX_ &ST(0), sv, 0);
962 EXTEND(shared_sv *shared, IV count)
966 av_extend((AV*)SHAREDSvPTR(shared), count);
970 STORESIZE(shared_sv *shared,IV count)
974 av_fill((AV*) SHAREDSvPTR(shared), count);
981 EXISTS(shared_sv *shared, SV *index)
985 if (SvTYPE(SHAREDSvPTR(shared)) == SVt_PVAV) {
987 exists = av_exists((AV*) SHAREDSvPTR(shared), SvIV(index));
991 char *key = SvPV(index,len);
993 exists = hv_exists((HV*) SHAREDSvPTR(shared), key, len);
996 ST(0) = (exists) ? &PL_sv_yes : &PL_sv_no;
1001 FIRSTKEY(shared_sv *shared)
1009 hv_iterinit((HV*) SHAREDSvPTR(shared));
1010 entry = hv_iternext((HV*) SHAREDSvPTR(shared));
1012 key = hv_iterkey(entry,&len);
1014 ST(0) = sv_2mortal(newSVpv(key, len));
1017 ST(0) = &PL_sv_undef;
1023 NEXTKEY(shared_sv *shared, SV *oldkey)
1031 entry = hv_iternext((HV*) SHAREDSvPTR(shared));
1033 key = hv_iterkey(entry,&len);
1035 ST(0) = sv_2mortal(newSVpv(key, len));
1038 ST(0) = &PL_sv_undef;
1043 MODULE = threads::shared PACKAGE = threads::shared
1055 if( (shared = Perl_sharedsv_find(aTHX_ ref)) ){
1056 ST(0) = sv_2mortal(newSViv(PTR2IV(shared)));
1070 if( (shared = Perl_sharedsv_find(aTHX_ ref)) ){
1071 if (SHAREDSvPTR(shared)) {
1072 ST(0) = sv_2mortal(newSViv(SvREFCNT(SHAREDSvPTR(shared))));
1076 Perl_warn(aTHX_ "%" SVf " s=%p has no shared SV",ST(0),shared);
1080 Perl_warn(aTHX_ "%" SVf " is not shared",ST(0));
1089 Perl_croak(aTHX_ "Argument to share needs to be passed as ref");
1093 Perl_sharedsv_share(aTHX_ ref);
1094 RETVAL = newRV(ref);
1099 lock_enabled(SV *ref)
1104 Perl_croak(aTHX_ "Argument to lock needs to be passed as ref");
1108 shared = Perl_sharedsv_find(aTHX_ ref);
1110 croak("lock can only be used on shared values");
1111 Perl_sharedsv_lock(aTHX_ shared);
1114 cond_wait_enabled(SV *ref_cond, SV *ref_lock = 0)
1115 PROTOTYPE: \[$@%];\[$@%]
1118 perl_cond* user_condition;
1123 if (!ref_lock || ref_lock == ref_cond) same = 1;
1125 if(!SvROK(ref_cond))
1126 Perl_croak(aTHX_ "Argument to cond_wait needs to be passed as ref");
1127 ref_cond = SvRV(ref_cond);
1129 ref_cond = SvRV(ref_cond);
1130 shared = Perl_sharedsv_find(aTHX_ ref_cond);
1132 croak("cond_wait can only be used on shared values");
1134 user_condition = &shared->user_cond;
1136 if (!SvROK(ref_lock))
1137 Perl_croak(aTHX_ "cond_wait lock needs to be passed as ref");
1138 ref_lock = SvRV(ref_lock);
1139 if (SvROK(ref_lock)) ref_lock = SvRV(ref_lock);
1140 shared = Perl_sharedsv_find(aTHX_ ref_lock);
1142 croak("cond_wait lock must be a shared value");
1144 if(shared->lock.owner != aTHX)
1145 croak("You need a lock before you can cond_wait");
1146 /* Stealing the members of the lock object worries me - NI-S */
1147 MUTEX_LOCK(&shared->lock.mutex);
1148 shared->lock.owner = NULL;
1149 locks = shared->lock.locks;
1150 shared->lock.locks = 0;
1152 /* since we are releasing the lock here we need to tell other
1153 people that is ok to go ahead and use it */
1154 COND_SIGNAL(&shared->lock.cond);
1155 COND_WAIT(user_condition, &shared->lock.mutex);
1156 while(shared->lock.owner != NULL) {
1157 /* OK -- must reacquire the lock */
1158 COND_WAIT(&shared->lock.cond, &shared->lock.mutex);
1160 shared->lock.owner = aTHX;
1161 shared->lock.locks = locks;
1162 MUTEX_UNLOCK(&shared->lock.mutex);
1165 cond_timedwait_enabled(SV *ref_cond, double abs, SV *ref_lock = 0)
1166 PROTOTYPE: \[$@%]$;\[$@%]
1169 perl_cond* user_condition;
1174 if (!ref_lock || ref_cond == ref_lock) same = 1;
1176 if(!SvROK(ref_cond))
1177 Perl_croak(aTHX_ "Argument to cond_timedwait needs to be passed as ref");
1178 ref_cond = SvRV(ref_cond);
1180 ref_cond = SvRV(ref_cond);
1181 shared = Perl_sharedsv_find(aTHX_ ref_cond);
1183 croak("cond_timedwait can only be used on shared values");
1185 user_condition = &shared->user_cond;
1187 if (!SvROK(ref_lock))
1188 Perl_croak(aTHX_ "cond_timedwait lock needs to be passed as ref");
1189 ref_lock = SvRV(ref_lock);
1190 if (SvROK(ref_lock)) ref_lock = SvRV(ref_lock);
1191 shared = Perl_sharedsv_find(aTHX_ ref_lock);
1193 croak("cond_timedwait lock must be a shared value");
1195 if(shared->lock.owner != aTHX)
1196 croak("You need a lock before you can cond_wait");
1198 MUTEX_LOCK(&shared->lock.mutex);
1199 shared->lock.owner = NULL;
1200 locks = shared->lock.locks;
1201 shared->lock.locks = 0;
1202 /* since we are releasing the lock here we need to tell other
1203 people that is ok to go ahead and use it */
1204 COND_SIGNAL(&shared->lock.cond);
1205 RETVAL = Perl_sharedsv_cond_timedwait(user_condition, &shared->lock.mutex, abs);
1206 while (shared->lock.owner != NULL) {
1207 /* OK -- must reacquire the lock... */
1208 COND_WAIT(&shared->lock.cond, &shared->lock.mutex);
1210 shared->lock.owner = aTHX;
1211 shared->lock.locks = locks;
1212 MUTEX_UNLOCK(&shared->lock.mutex);
1220 cond_signal_enabled(SV *ref)
1225 Perl_croak(aTHX_ "Argument to cond_signal needs to be passed as ref");
1229 shared = Perl_sharedsv_find(aTHX_ ref);
1230 if (ckWARN(WARN_THREADS) && shared->lock.owner != aTHX)
1231 Perl_warner(aTHX_ packWARN(WARN_THREADS),
1232 "cond_signal() called on unlocked variable");
1234 croak("cond_signal can only be used on shared values");
1235 COND_SIGNAL(&shared->user_cond);
1238 cond_broadcast_enabled(SV *ref)
1243 Perl_croak(aTHX_ "Argument to cond_broadcast needs to be passed as ref");
1247 shared = Perl_sharedsv_find(aTHX_ ref);
1249 croak("cond_broadcast can only be used on shared values");
1250 if (ckWARN(WARN_THREADS) && shared->lock.owner != aTHX)
1251 Perl_warner(aTHX_ packWARN(WARN_THREADS),
1252 "cond_broadcast() called on unlocked variable");
1253 COND_BROADCAST(&shared->user_cond);
1257 bless(SV* ref, ...);
1264 stash = CopSTASH(PL_curcop);
1270 if (ssv && !SvGMAGICAL(ssv) && !SvAMAGIC(ssv) && SvROK(ssv))
1271 Perl_croak(aTHX_ "Attempt to bless into a reference");
1272 ptr = SvPV(ssv,len);
1273 if (ckWARN(WARN_MISC) && len == 0)
1274 Perl_warner(aTHX_ packWARN(WARN_MISC),
1275 "Explicit blessing to '' (assuming package main)");
1276 stash = gv_stashpvn(ptr, len, TRUE);
1279 (void)sv_bless(ref, stash);
1281 shared = Perl_sharedsv_find(aTHX_ ref);
1287 SV* fake_stash = newSVpv(HvNAME(stash),0);
1288 (void)sv_bless(SHAREDSvPTR(shared),(HV*)fake_stash);
1297 #endif /* USE_ITHREADS */
1302 Perl_sharedsv_init(aTHX);
1303 #endif /* USE_ITHREADS */